P5CS — Oryza sativa Indica Group

Summary

BGIOSGA004801 (symbol P5CS, preferred name OiP5CS) on chromosome 1 of Indica rice encodes a bifunctional enzyme with D1-pyrroline-5-carboxylate synthetase activity, combining glutamate 5-kinase (EC 2.7.2.11) and glutamylphosphate reductase (EC 1.2.1.41) activities, and binds ATP. In this species, the gene is associated with L-proline biosynthesis, the ascorbate-glutathione cycle, response to desiccation, hyperosmotic salinity response, oxidative stress, abscisic acid, and seed germination, as well as root development, chlorophyll fluorescence, calcium signaling, and the transition to reproductive phase. Observed phenotypes link it to salt stress, drought, oxidative stress, and ABA. The gene is also associated with grain yield, grain weight, amylose content, leaf chlorophyll content, photosynthetic rate, respiration rate, and root length. Related genes in other species are linked to drought tolerance, osmotic stress tolerance, heat tolerance, and root elongation under low water potential.